/* * This file is part of the Chelsio T4 Ethernet driver for Linux. * * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/if.h> #include <linux/if_vlan.h> #include <linux/jhash.h> #include <linux/module.h> #include <linux/debugfs.h> #include <linux/seq_file.h> #include <net/neighbour.h> #include "cxgb4.h" #include "l2t.h" #include "t4_msg.h" #include "t4fw_api.h" #include "t4_regs.h" #include "t4_values.h" /* identifies sync vs async L2T_WRITE_REQs */ #define SYNC_WR_S … #define SYNC_WR_V(x) … #define SYNC_WR_F … struct l2t_data { … }; static inline unsigned int vlan_prio(const struct l2t_entry *e) { … } static inline void l2t_hold(struct l2t_data *d, struct l2t_entry *e) { … } /* * To avoid having to check address families we do not allow v4 and v6 * neighbors to be on the same hash chain. We keep v4 entries in the first * half of available hash buckets and v6 in the second. We need at least two * entries in our L2T for this scheme to work. */ enum { … }; static inline unsigned int arp_hash(struct l2t_data *d, const u32 *key, int ifindex) { … } static inline unsigned int ipv6_hash(struct l2t_data *d, const u32 *key, int ifindex) { … } static unsigned int addr_hash(struct l2t_data *d, const u32 *addr, int addr_len, int ifindex) { … } /* * Checks if an L2T entry is for the given IP/IPv6 address. It does not check * whether the L2T entry and the address are of the same address family. * Callers ensure an address is only checked against L2T entries of the same * family, something made trivial by the separation of IP and IPv6 hash chains * mentioned above. Returns 0 if there's a match, */ static int addreq(const struct l2t_entry *e, const u32 *addr) { … } static void neigh_replace(struct l2t_entry *e, struct neighbour *n) { … } /* * Write an L2T entry. Must be called with the entry locked. * The write may be synchronous or asynchronous. */ static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync) { … } /* * Send packets waiting in an L2T entry's ARP queue. Must be called with the * entry locked. */ static void send_pending(struct adapter *adap, struct l2t_entry *e) { … } /* * Process a CPL_L2T_WRITE_RPL. Wake up the ARP queue if it completes a * synchronous L2T_WRITE. Note that the TID in the reply is really the L2T * index it refers to. */ void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl) { … } /* * Add a packet to an L2T entry's queue of packets awaiting resolution. * Must be called with the entry's lock held. */ static inline void arpq_enqueue(struct l2t_entry *e, struct sk_buff *skb) { … } int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb, struct l2t_entry *e) { … } EXPORT_SYMBOL(…); /* * Allocate a free L2T entry. Must be called with l2t_data.lock held. */ static struct l2t_entry *alloc_l2e(struct l2t_data *d) { … } static struct l2t_entry *find_or_alloc_l2e(struct l2t_data *d, u16 vlan, u8 port, u8 *dmac) { … } /* Called when an L2T entry has no more users. The entry is left in the hash * table since it is likely to be reused but we also bump nfree to indicate * that the entry can be reallocated for a different neighbor. We also drop * the existing neighbor reference in case the neighbor is going away and is * waiting on our reference. * * Because entries can be reallocated to other neighbors once their ref count * drops to 0 we need to take the entry's lock to avoid races with a new * incarnation. */ static void _t4_l2e_free(struct l2t_entry *e) { … } /* Locked version of _t4_l2e_free */ static void t4_l2e_free(struct l2t_entry *e) { … } void cxgb4_l2t_release(struct l2t_entry *e) { … } EXPORT_SYMBOL(…); /* * Update an L2T entry that was previously used for the same next hop as neigh. * Must be called with softirqs disabled. */ static void reuse_entry(struct l2t_entry *e, struct neighbour *neigh) { … } struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh, const struct net_device *physdev, unsigned int priority) { … } EXPORT_SYMBOL(…); u64 cxgb4_select_ntuple(struct net_device *dev, const struct l2t_entry *l2t) { … } EXPORT_SYMBOL(…); /* * Called when the host's neighbor layer makes a change to some entry that is * loaded into the HW L2 table. */ void t4_l2t_update(struct adapter *adap, struct neighbour *neigh) { … } /* Allocate an L2T entry for use by a switching rule. Such need to be * explicitly freed and while busy they are not on any hash chain, so normal * address resolution updates do not see them. */ struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan, u8 port, u8 *eth_addr) { … } /** * cxgb4_l2t_alloc_switching - Allocates an L2T entry for switch filters * @dev: net_device pointer * @vlan: VLAN Id * @port: Associated port * @dmac: Destination MAC address to add to L2T * Returns pointer to the allocated l2t entry * * Allocates an L2T entry for use by switching rule of a filter */ struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan, u8 port, u8 *dmac) { … } EXPORT_SYMBOL(…); struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end) { … } static inline void *l2t_get_idx(struct seq_file *seq, loff_t pos) { … } static void *l2t_seq_start(struct seq_file *seq, loff_t *pos) { … } static void *l2t_seq_next(struct seq_file *seq, void *v, loff_t *pos) { … } static void l2t_seq_stop(struct seq_file *seq, void *v) { … } static char l2e_state(const struct l2t_entry *e) { … } bool cxgb4_check_l2t_valid(struct l2t_entry *e) { … } EXPORT_SYMBOL(…); static int l2t_seq_show(struct seq_file *seq, void *v) { … } static const struct seq_operations l2t_seq_ops = …; static int l2t_seq_open(struct inode *inode, struct file *file) { … } const struct file_operations t4_l2t_fops = …;
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